One more item:
I've heard from a meter repair that one should not use isopropyl alcohol to clean PC contacts or zebra strips. He claims that it will "attact water" and will cause the repair to fail.
I freely and readily admit that this sounds like BS (or other expression for "hogwash") but I have to admit that when I used non alcohol based contact cleaners, the repairs last longer. The first few meters I repaired all re-developed the problem, but I haven't had a relapse in any of the meters I've not used alcohol with. Anecdotal at best, non scientific, and possibly coincidental, but I thought I'd mention it.
I'll also add that the 27/25 is my favorite system - six screws hold the PC board to the front case, sandwiching the LCD in between. Second best is the old 70 series, with four screws holding the PCB to the LCD bracket. I don't like the 87 "snap together model" system. I've replaced a lot of the "shield" assys that have their tabs broken off. (another item to buy from Fluke directly and not the e-bay seller, who makes a handsome profit) One has to know the part number, however.